#include <stdio.h>

int main()
{
    int m = 0x80000000;
    int n = 0x70000000;
    printf("%x\n", m - n);


    // -1 - 2
    // -1 0x10000001 ???
    // -2 0x10000002 ???
    // -1 + -2 == -3 -> error 536870915  
    int x = 0x10000001;
    int y = 0x10000002;
    printf("%d\n", x + y);
    return 0;
}